<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>CSS定位</title>
<style>
	body{ height:1000px;}
	#top{ width:35px; background:#bbbbbb; color:white; 
		font-size:12px; text-align:center; 
		letter-spacing:1px; line-height:16px; 
		position:fixed; bottom:4px; right:4px; }
</style>
</head>
<body>
<div id="top">回到顶部</div>
</body>
</body>
</html>




